static void sensorsSetupSlaveRead(void)
{
// Now begin to set up the slaves
#ifdef SENSORS_MPU6500_DLPF_256HZ
// As noted in registersheet 4.4: "Data should be sampled at or above sample rate;
// SMPLRT_DIV is only used for 1kHz internal sampling." Slowest update rate is then 500Hz.
mpu6500SetSlave4MasterDelay(15); // read slaves at 500Hz = (8000Hz / (1 + 15))
#else
mpu6500SetSlave4MasterDelay(9); // read slaves at 100Hz = (500Hz / (1 + 4))
#endif
mpu6500SetI2CBypassEnabled(false);
mpu6500SetWaitForExternalSensorEnabled(true); // the slave data isn't so important for the state estimation
mpu6500SetInterruptMode(0); // active high
mpu6500SetInterruptDrive(0); // push pull
mpu6500SetInterruptLatch(0); // latched until clear
mpu6500SetInterruptLatchClear(1); // cleared on any register read
mpu6500SetSlaveReadWriteTransitionEnabled(false); // Send a stop at the end of a slave read
mpu6500SetMasterClockSpeed(13); // Set i2c speed to 400kHz
#ifdef SENSORS_ENABLE_MAG_AK8963
if (isMagnetometerPresent)
{
// Set registers for MPU6500 master to read from
mpu6500SetSlaveAddress(0, 0x80 | AK8963_ADDRESS_00); // set the magnetometer to Slave 0, enable read
mpu6500SetSlaveRegister(0, AK8963_RA_ST1); // read the magnetometer heading register
mpu6500SetSlaveDataLength(0, SENSORS_MAG_BUFF_LEN); // read 8 bytes (ST1, x, y, z heading, ST2 (overflow check))
mpu6500SetSlaveDelayEnabled(0, true);
mpu6500SetSlaveEnabled(0, true);
}
#endif
#ifdef SENSORS_ENABLE_PRESSURE_LPS25H
if (isBarometerPresent)
{
// Configure the LPS25H as a slave and enable read
// Setting up two reads works for LPS25H fifo avg filter as well as the
// auto inc wraps back to LPS25H_PRESS_OUT_L after LPS25H_PRESS_OUT_H is read.
mpu6500SetSlaveAddress(1, 0x80 | LPS25H_I2C_ADDR);
mpu6500SetSlaveRegister(1, LPS25H_STATUS_REG | LPS25H_ADDR_AUTO_INC);
mpu6500SetSlaveDataLength(1, SENSORS_BARO_BUFF_S_P_LEN);
mpu6500SetSlaveDelayEnabled(1, true);
mpu6500SetSlaveEnabled(1, true);
mpu6500SetSlaveAddress(2, 0x80 | LPS25H_I2C_ADDR);
mpu6500SetSlaveRegister(2, LPS25H_TEMP_OUT_L | LPS25H_ADDR_AUTO_INC);
mpu6500SetSlaveDataLength(2, SENSORS_BARO_BUFF_T_LEN);
mpu6500SetSlaveDelayEnabled(2, true);
mpu6500SetSlaveEnabled(2, true);
}
#endif
// Enable sensors after configuration
mpu6500SetI2CMasterModeEnabled(true);
mpu6500SetIntDataReadyEnabled(true);
}
static void sensorsDeviceInit(void) {
isMagnetometerPresent = false;
isBarometerPresent = false;
// Wait for sensors to startup
while (xTaskGetTickCount() < 1000);
i2cdevInit(I2C3_DEV);
mpu6500Init(I2C3_DEV);
if (mpu6500TestConnection() == true)
{
DEBUG_PRINT("MPU9250 I2C connection [OK].\n");
}
else
{
DEBUG_PRINT("MPU9250 I2C connection [FAIL].\n");
}
mpu6500Reset();
vTaskDelay(M2T(50));
// Activate MPU6500
mpu6500SetSleepEnabled(false);
// Enable temp sensor
mpu6500SetTempSensorEnabled(true);
// Disable interrupts
mpu6500SetIntEnabled(false);
// Connect the HMC5883L to the main I2C bus
mpu6500SetI2CBypassEnabled(true);
// Set x-axis gyro as clock source
mpu6500SetClockSource(MPU6500_CLOCK_PLL_XGYRO);
// Set gyro full scale range
mpu6500SetFullScaleGyroRange(IMU_GYRO_FS_CFG);
// Set accelerometer full scale range
mpu6500SetFullScaleAccelRange(IMU_ACCEL_FS_CFG);
#ifdef IMU_MPU6500_DLPF_256HZ
// 256Hz digital low-pass filter only works with little vibrations
// Set output rate (15): 8000 / (1 + 15) = 500Hz
mpu6500SetRate(15);
// Set digital low-pass bandwidth
mpu6500SetDLPFMode(MPU6500_DLPF_BW_256);
#else
// To low DLPF bandwidth might cause instability and decrease agility
// but it works well for handling vibrations and unbalanced propellers
// Set output rate (1): 1000 / (1 + 1) = 500Hz
mpu6500SetRate(1);
// Set digital low-pass bandwidth
mpu6500SetDLPFMode(MPU6500_DLPF_BW_98);
#endif
// delay 3 seconds until the quad has stabilized enough to pass the test
bool mpu6500SelfTestPassed = false;
for (int i=0; i<300; i++)
{
if(mpu6500SelfTest() == true)
{
mpu6500SelfTestPassed = true;
break;
}
else
{
vTaskDelay(M2T(10));
}
}
configASSERT(mpu6500SelfTestPassed);
// Now begin to set up the slaves
mpu6500SetSlave4MasterDelay(4); // read slaves at 100Hz = (500Hz / (1 + 4))
#ifdef IMU_ENABLE_MAG_AK8963
ak8963Init(I2C3_DEV);
if (ak8963TestConnection() == true)
{
isMagnetometerPresent = true;
ak8963SetMode(AK8963_MODE_16BIT | AK8963_MODE_CONT2); // 16bit 100Hz
configASSERT(ak8963SelfTest());
DEBUG_PRINT("AK8963 I2C connection [OK].\n");
mpu6500SetSlaveAddress(0, 0x80 | AK8963_ADDRESS_00); // set the magnetometer to Slave 0, enable read
mpu6500SetSlaveRegister(0, AK8963_RA_HXL); // read the magnetometer heading register
mpu6500SetSlaveDataLength(0, 6); // read 6 bytes (x, y, z heading)
mpu6500SetSlaveDelayEnabled(0, true);
mpu6500SetSlaveEnabled(0, true);
}
else
{
DEBUG_PRINT("AK8963 I2C connection [FAIL].\n");
}
#endif
#ifdef IMU_ENABLE_PRESSURE_LPS25H
lps25hInit(I2C3_DEV);
if (lps25hTestConnection() == true)
{
lps25hSetEnabled(true);
isBarometerPresent = true;
configASSERT(lps25hSelfTest());
DEBUG_PRINT("LPS25H I2C connection [OK].\n");
mpu6500SetSlaveAddress(1, 0x80 | LPS25H_I2C_ADDR); // set the barometer to Slave 1, enable read
mpu6500SetSlaveRegister(1, LPS25H_PRESS_OUT_XL | LPS25H_ADDR_AUTO_INC);
mpu6500SetSlaveDataLength(1, 5);
mpu6500SetSlaveDelayEnabled(1, true);
mpu6500SetSlaveEnabled(1, true);
}
else
{
//TODO: Should sensor test fail hard if no connection
DEBUG_PRINT("LPS25H I2C connection [FAIL].\n");
}
#endif
mpu6500SetI2CBypassEnabled(false);
mpu6500SetI2CMasterModeEnabled(true);
mpu6500SetWaitForExternalSensorEnabled(false); // the slave data isn't so important for the state estimation
mpu6500SetInterruptMode(0); // active high
mpu6500SetInterruptDrive(0); // push pull
mpu6500SetInterruptLatch(0); // latched until clear
mpu6500SetInterruptLatchClear(1); // cleared on any register read
mpu6500SetIntDataReadyEnabled(true);
}